p/n safety switch ground
#1
#2
Find the neutral switch wire in the harness (leads to cavity/pin 30 on the PCM), and run it to ground. Should be a brown wire with a yellow stripe according to the sticky FAQ (PCM connector diagram). That's if you have the wiring harness for an automatic, as I do in my 5 speed Magnum swap. If you have a wire harness for a manual truck, you may need to add a wire to that position on the connector which may require finding a connector pin and inserting it into that cavity (30).
Last edited by ragged89; 04-27-2017 at 07:37 PM.
#4
#7
It may, if the PCM is looking for a lock-up torque converter (automatic trans). I'm a little rusty on that one, and too short on time at the moment to review it (sorry). It shouldn't cause any driveability issues though and the Park/Neutral shouldn't be a problem once its grounded.
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#8
It may, if the PCM is looking for a lock-up torque converter (automatic trans). I'm a little rusty on that one, and too short on time at the moment to review it (sorry). It shouldn't cause any driveability issues though and the Park/Neutral shouldn't be a problem once its grounded.
#9
Not sure how similar the 90 and 93 pcm's are, but on my 90, the lockup had nothing to do with the pcm, other than the ground signal to fire the solenoid. However, there's a speed switch on the automatic transmission tailshaft (where the speedo cable connects) that does feed the pcm that's used for the lockup and overdrive solenoids....The absence of that speed switch might throw a code, but nothing you can do about that. In my re-wire I kept the speed switch but since I removed the pcm, it goes nowhere but to the engine connector.
I'm actually not sure which PCM he's using, maybe the Mopar HP? Not sure which year either, but even up thru '95, I know there's not a whole lot of talking between the PCM and transmission.
#10
If the PCM is being removed, but if you still want lockup and overdrive, there's always the method used by PATC for their 727/518 upgrade kit ..
https://transmissioncenter.net/shop/...iring-diagram/
RwP
https://transmissioncenter.net/shop/...iring-diagram/
RwP